318 SPECIES OF coELus (coleoptera; tenebrionidae) 



The original species of Eschscholtz and LeConte are not only 

 very distinct but they are -centers about which a number of geo- 

 graphical races and forms may be assembled. These two groups 

 may be defined as follows: 



Epistoma arising gradually from the frontal suture; sides of the mentum 



more or less arcuate Globosus Group 



Epistoma arising abruptly from the frontal suture; sides of the mentum 

 straight, sometimes subangulate at middle and strongly divergent. 



Ciliatus Group 



The above characters vary within certain limits and if one of 

 them is not as evident as might be the other will be, and acts as a 

 control in determining the group. They do not intergrade. In 

 the Ciliatus Group the front of the head has a punctate triangu- 

 larly flattened area, with its apex at the vertex and its base at the 

 frontal suture, the sides extending from vertex to front of the 

 eyes. In the Globosus Group the front is more or less feebly 

 convex and the transverse impression is much more shallow. 



Globosus Group 



Synopsis of the Globosus Group 



Epistoma very deeply sinuate. Mainland species. 



Size medium; pronotal surface deeply and closely punctate throughout. 



globosus Leconte 

 Size large. 



Form more or less oblong-oval to oblong-elliptical; pronotal surface with 

 large impunctate areas, otherwise sparsely and more or less finely and 



deeply punctate globosus var. grossus Casey 



Form broader and oblong-oval in both sexes; pronotal punctures coarse, 

 rather closely and quite evenly placed. 



globosus var. grossus form saginatus Casey 

 Epistoma broadly and very feebly sinuate, the sinus generally subevenly 

 rounded. Insular species. 



Elytra as densely but more finely punctate than the pronotiun, feeblj' as- 

 perate on the declivity; pronotum moderately densely, evenly punctate 



throughout. Islands of San Nicolas to San Miguel pacificus Fall 



Elytra finely, densely punctate without trace of asperity; pronotum subo- 

 paque, densely and coarsely punctate. Island of San Clementc. 



remotus Fall 



Coelus globosus Leconte 



A series of eighty-one specimens taken from a single sand dune 

 at Ocean Beach in February, 1891, shows this species to be ab- 

 solutely distinct from ciliatus Esch. In these and others f aken at 



